Adds class for anchor links to have visual onhover state

[petesfrench]

Done

Adds class for anchor links to have visual onhover state

Fixes [list issues/bugs if needed]

QA

• Open demo
• Make sure that the anchor icon appears on hover and focus as expected
• Review updated documentation:
  • https://vanilla-framework-5120.demos.haus/docs/patterns/links#anchor-link

Check if PR is ready for release

If this PR contains Vanilla SCSS code changes, it should contain the following changes to make sure it's ready for the release:

• PR should have one of the following labels to automatically categorise it in release notes:
  • Feature 🎁, Breaking Change 💣, Bug 🐛, Documentation 📝, Maintenance 🔨.
• Vanilla version in package.json should be updated relative to the most recent release, following semver convention:
  • if CSS class names are not changed it can be bugfix relesase (x.x.X)
  • if CSS class names are changed/added/removed it should be minor version (x.X.0)
  • see the wiki for more details
• Any changes to component class names (new patterns, variants, removed or added features) should be listed on the what's new page.

Screenshots

[webteam-app]

Demo

Jenkins

demos.haus

[bartaz]

As per discussion with Lyubo: we need to update the icon size to always use the default 16px size (even with h2 header).

[petesfrench]

@bartaz updated the icon size. What else do we need to do to get this merged?

[bartaz]

Looks good to go!